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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '489d10b2f844a6a77ec6d309374830444826f89c5e63dd7da5ec0303fc23c1bf' 
  AND token = 'x5VUfuoJkTTbT531A5SH6pv2x07hCwFUwsVFtRvbtog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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