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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdde9f69c81c4440621e2e2344f53f68421ae592788e84ee383e8257e28687dc' 
  AND token = '6Eo+gnUCY46IhqaUN72rndY2RBIfSc5jGDA3aoo3SX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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