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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '861394409c3ebf255ce818aebe607c2c4e76435669d57b96ba2f412eb9c05f29' 
  AND token = 'n2Uxp5gv1X217XGf8mcXCbbIx1eTlTx8FyY54kbpxnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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