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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15dab66400bf8a109de6b3de80dbd887f5d4a4c7b56fb7341602aaf3045150ba' 
  AND token = 'jm6bnDs33m6asZcl+5Lwcd30Gnvwad0ufuNICN+z54c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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