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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cda81201f4135a2f8a9d9ed2835993757b5a834fbb32d552d03ef71aa8ab9b2' 
  AND token = 'H7LVYWmq4voM8eip/6vRz3lA8uNS/BdPiTa6Zvz0nz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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