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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c172b8d55ea42919d85539e78a444b0e623fb21b68408e66ff2a71f18ad79f3' 
  AND token = 'xpXvpDs7T+hrTvb5bRKPIiZeTzpII5EzBh6Op+BeeVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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