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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0254f94ec26cb59df93f5de23ac1362729cd98a74117a4ae6305a174ae8c881' 
  AND token = '0AQrRxap0/dNwqSk6jlQGBbGRxG2/talsCJdt9zbnPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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