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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03af5f1ea2d672f4ef419a6ab7a01d9d7ba0b83ec53d9fbc126a9ae075bb46c1' 
  AND token = 'lXw6dTO/Az629GI+ETX2U+7EAt8bifoQgNUbOMVRoAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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