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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac0330a43cc90208ae03a2ece1d806bb16209feaf1a9cd9c33e94fc6b1f8c59c' 
  AND token = 'FluF+KV6v5XqjuxBlUsfUYdmQLd/HUVb2Hp4rIuKx/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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