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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6db13e79d8ce59f732d5df2623f098c8170894d0915d01a3feb3a7611a2d1db2' 
  AND token = 'OgYv2w6YNi5Tq5rerMNl1UnBwyBNqglo6QY09ezNd3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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