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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02e3445a1aeb3669ca4a6c18e7b019171c3d706e44277bb74442be3b75f8c623' 
  AND token = 'Oq6mF4X9wFRMACbCeXrApbXtSOGZaTX0rgUCOVUILbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}