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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1e7af7b6b6034946a3a2578a7b81e0dcf1c680771b4f8c935cda45e39ba577f' 
  AND token = 'ZQ51UohMi9Jpe40NBDySTcrXJCXWCgx5csGRRPiCUHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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