SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6096f965a5eabc8dc457b107b1cdf6d172938dfe27fd66c169c5877093825e6' 
  AND token = 'N9CM7fFES/IiDng2hsqAbGH6JMVE6XjJLBTdDhv4Lys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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