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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5dbfa17e799ede7370a4021af286f55fc2fa35e80378e949d23e363029c47f0' 
  AND token = 'nnHAqg3yPa+4kuiRC7WTO5TkRTmwE0N0XtvXUUQZdu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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