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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '098e0405e0b5d6c0e04b5f67bd0826da3b47de302383948a640df45a3e9f1347' 
  AND token = 'm9BKQRsRInV/Q4yE0EoACp/URehhdxpQPd1zdCFGn60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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