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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd98948e034e24711401d0226272cb4dcb6c6bb81aa8188a4dfca14dd4427e7d7' 
  AND token = 'g5wKdBzOyenMn98Q1Wd4mdFDXqUVpHD9gU4smB+VS94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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