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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c15f967af8f6dd6cd68678cf77372df9e41789f28b515937b600c2e218b356ce' 
  AND token = '8N4ZhLnwCLhIeLLHSyDLhaIL74hZQe3DY8c1HQ4VgPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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