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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0691004917ce9bc1ecc12e140f4577735217f45e35a2298f69ce29f1d089fde5' 
  AND token = '0W1QE1Ubk1xIRKaujtdSzxE4K4WzcuqU6eHzvaFol5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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