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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ded70a0a6a2935f2550fa3f91cd213a9d60301ae99cef9ca9302c927aad7d1cf' 
  AND token = 'hMERRq7CHHwjJkJaqVbEttLxlqMq1tKKt28xprUt0bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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