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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59eaa83eeb132278fb4bf811df29139603b545b61a3b67173de45cbd8d804c8e' 
  AND token = 'gG9tAZPlNNtt527Dteezbf+z3edAsbisqjP2qx42tfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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