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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2474eac17879c37ae13a84da95c58f1ab4d2a539765267e0bc9538e06e7d982' 
  AND token = 'TSMUEbrCtuuAYCP/PBm4zT+FTBBYaGnLTtplaAclEY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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