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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9da28f2b61b16d1cccbda45239d21ae73b4363c281d9079f98bae8cfef7c47ea' 
  AND token = 'iEAYx05Isud7XpkNayxF2V6xq8Wr28TTBUjdNxaojvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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