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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e209d7a5dc10982ffb4c1071504fc7cdb6cbefa0085d13c2d0965d9e3039388' 
  AND token = 'evFTKJ7cBgSLa0tjUIhnFrMEQ3UmpIwEv1sWiLMjx6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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