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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd232973ad1bea5d576b680bb9d2cdd275b654d6289a2ae0d62371b487136d31e' 
  AND token = 'T5pv1dzF68ZmQss+OLODjgu4SXe0no/obBa32dpIhro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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