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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e8470bd61a7120d4b1c7deb20d8fdbe6c674ef70f83e6d3dbc2e01b73eaaf7a' 
  AND token = 'cglWBBigA7E01aJE99UWQOZHImkxhMdactqPdMsV4rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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