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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33c20630df1336cda83faced93c7fbd9c2efa5daeeaa3761adc1dd14592f5092' 
  AND token = 'Qg50sJH8lwnx7XRrFPMk/Jm1oxichNRv6y0tnWCGtrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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