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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a85685d9c601aae9f1c1fe84aa4ac0c5bf4c645350ea2edfc8dc163aa75664a' 
  AND token = 'hSW+BfO0hOxQJajUqHgGq2JQoGVnj1YtGLcsFqqh5O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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