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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54af01ece5107a82439cb32c1b45e5f96f9a60a5c79387f4558b1b588416adc5' 
  AND token = '4tdQYSKzmKe1TkrPuXBh3NemlvBVhnX+axVhXiQ5iyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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