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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b12cf9960f09ba10a0de99b5cb247eab8ace8c80f759f0d4872c58d14710e6fc' 
  AND token = '50E6f5mLclgX4Jiq8uah8uJk2aBD1MfafVS0pWa7HO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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