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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6d5da85055b34cb3b57953e20d19653b3c9bbdeb4d099ca8623ab41f329820b' 
  AND token = 'tZzIswJp3mUsy9dk0UNbVX1Qd5JMEZJeMErBaRXaJ20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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