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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f0557454d7c689788bfffc86fc23473394ffdf62e1199b41d1843a774125eec' 
  AND token = '8RLipQUeQW2HHGLk4ih6WGCRZ6A1/xI6IIs5o/fzetQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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