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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aedbf2115bab1f76ad3fe7e91f3d8a0cb8f8527a9623eee6fbcd82364aac0bec' 
  AND token = 'KeCD2wTvtGbbxi/CH5Lwi521XWI/VHBvh1nvGwferB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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