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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbb3355de61e012b0c67a57f6de219aa6a07990499c6fa8d7a0ce107ac30820d' 
  AND token = 'qs6y7jmuh+RNJa5eAGQq8lkSmv9704+rx8wWEtESicM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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