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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a66933a2209b4fcd97c497d5b22e0ce6eb9c80cc1cdd2e7b4fc864df5a312ffb' 
  AND token = 'lma0EN0pJtEFrJ3GyYtNPyZoCjJ9ekrut88LJV4k67g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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