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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd680d4db93b3bca88c4864bcd400ffad330299344f8d010840ad6ec09737d6e4' 
  AND token = 'Spw27yTdCk98x5iuUx7Kaqjtgkw343noPWc4578P9Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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