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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4d94b3f58e2f13437e5b4de5835f92b2c38e94525abdca1099f32758f397595' 
  AND token = 'MXKFclsJQO1ekVK2MnE9+Q3SpskF3GIyasPogEALmNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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