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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de42027f10cf4db8a0e27e3d10b242bb3f2dc99116e60400cdf3840343d26eb1' 
  AND token = 'iEFwVsnwJHPwfp8xAtuy4rkcpV5ZCtxl1EhTGqFoTwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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