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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2470a43cefb4f8dd911fe98a42588e84969740d04250424e46c98c61be647734' 
  AND token = 'OlSqLQTce0u1HlpRmKHETnosEkJSFNBOOJYD96Cmsv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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