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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe0f76aaeba3784439c68865a393104026bcf784a704934a2f2b69614cf0ebb7' 
  AND token = 'xJpQ0ASP+4owFDs0rtDB7yHEgyQpKLx4hAAphLGdL/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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