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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '260f5da3db2051406df3bcd40d5b34fad85eb44dc14f1a98171792023c91b42e' 
  AND token = 'QUZL+dH/Pnsx0AJdAtq464OZnePcc+mNTatt+AaQoac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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