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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27d2eeff585c0a92a6c93def4948c1de0ce4751f4617a0ea8c27cbb806baf011' 
  AND token = 'GWMmKkiw6PJufcw51SMx/tQm6IOsisC0Ce0MkbkPhtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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