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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf03b0837067c9dcd47fd8d61fc6309beabef1dacbbb28c6f83b84213319d512' 
  AND token = 'GKXEPHmB1NMaMoPJ3aZA/6vrd8XrTLImb2Wv86S+YDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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