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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '206d8c140dfbe30c15e3a05fe4478ff95626a0ac22dc747086bc575702ab8cd1' 
  AND token = 'xH3qrZ72s4TeJq0IcSZGllBlBcFgBl6KWxqu3VffZWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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