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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19bee1b5123570e23995919da1da175ea20aa25cbf3c22ed6218eae061cb060e' 
  AND token = '9eahjZBq4Q15M1hFrueI+11lA4FkeJwRPp9oW5kYZMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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